My crown vic keeps on accelerating slowly and wont get up to speed fast enough, when given generous amounts of gas it almost locks up and wont move, sometimes it dies as well and then sometimes it dies

I owned one of these. There is a groove under the butterfly horn of the throttle. There are 8 bolts and a $10 gasket. Often the EGR passage is clogged and it throws off the calibrations and when you clean this groove the engine will run much better.

Something wrong here. Ithought all cars would rev continousely as long as the accelerator was depressed.

Sounds like the voltage regulator has failed.
Check voltage at the battery with the engine at idle and again with the engine at cruise speed. Voltage should be around 13 volts at idle and 14.5 volts at cruise speed.

Have you had your transmission fluid and filter changed? Sounds like the fluid may have lost its viscostity

sounds like the trottle position sensor is acting up, if u have a scanner u can check it on live data, but it should thow a code some autoparts dealers offer free code reading

I HAVE HAD THE SAME PROBLEM ON SEVERAL CROWN VICS I HAVE WORKED ON ,& SOME OF THEM A SET OF PLUGS STOPPED IT,AND SOME OF THEM HAD TO HAVE 1 OR MORE COIL PACKS REPLACED, BUT THE PROBLEM THAT I FOUND THAT IF PLUGS & ALL COIL PACKS HAD BEEN REPLACED,AND IT WAS STILL IN THE IGNITION, IS THE WIRES GOING INTO THE PLUG ON THE COILPACK UNDER THE INTAKE TUBE, IF YOU REMOVE THE INTAKE TUBE,LOOK CLOSE AT THE WIRES FOR ANY BARE SPOTS,& LOOK AT THE BOTTOM OF THE INTAKR TUBE IF YOU CAN SEE WHERE IT HAS RUBBED IT,IT IS ALMOST A GIVEN THERE IS A BARE SPOT OR CRACKED INSOLATION ON THE WIRE, ENOUGH TO CAUSE A MISFIRE, (FYI) IT TOOK ME MANY TIMES OF INSPECTING BEFORE I LOOKED CLOSE ENOUGH TO SEE THE BARE SPOTS, BUT ALL YOU HAVE TO DO IS STRIP THE HARD PLASTIC AROUND THE WIRES BACK ENOUGH TILL YOU SEE GOOD CLEAN LOOKING WIRE,THEN SEPERATE THE WIRES AND IF YOU HAVE LIQUID ELECTICAL TAPE USE THAT AND THEN TAPE THEM WITH ROLL ELECTRICAL TAPE ,BUT IF YOU TAPE THEM UP GOOD SO WHEN THE WIRE IS BENT ENOUGH FOR THE INTAKE TUBE TO CLEAR ,& YOU CANNOT SEE THE WIRES GOING IN TO THE PLUG WITH A ROLL OF ELECTRICAL TAPE THAT WILL WORK TOO, I HOPE THIS TRICK WILL WORK AS GOOD FOR YOU AS HAS ME ON DOZENS OF CROWN VICS, ESPECIALLY P71 POLICE CARS.

Thermostat and a better maintenance program.

I would try to replace your spark plugs, and spark plug wires, My 88 Vic did the same thing...now it runs like a champ....you could also try fuel injector cleaner.

check your fuel pressure
if you dont have enough pressure this will happen
when the fuel pressure is good the system will just push the air out through the injectors or the fuel return line